To sacrifice oneself for a noble cause or the common good, even at the cost of one's life.
那位英雄怀着杀身救国的决心，奋不顾身地阻止了危机蔓延，保全了千万生灵的安全。
That hero, with the determination to sacrifice himself for the collective welfare, plunged into danger to prevent the crisis from spreading, ensuring the safety of countless lives.
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